EP0581284A2

EP0581284A2 - Non-contact IC card and manufacturing and testing methods of the same

Info

Publication number: EP0581284A2
Application number: EP93112171A
Authority: EP
Inventors: Hisashi c/o Mitsubishi Denki K.K. Ohno
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 1992-07-30
Filing date: 1993-07-29
Publication date: 1994-02-02
Anticipated expiration: 2013-07-29
Also published as: EP0581284B1; EP0581284A3; DE69314867T2; DE69314867T3; JP2672924B2; JPH0648078A; DE69314867D1; EP0581284B2; US5773880A

Abstract

A non-contact IC card comprising a circuit board (10), an electronic circuit (9) mounted on the circuit board (10) and having a plurality of functions, a package (14) sealing the electronic circuit (9), a plurality of testing wire conductors (8) disposed on the circuit board (10) and connected at one end to the electronic circuit (9) and exposed at the other end from the package (14) for individually testing the functions of the electronic circuit (9). Each of the other end of the testing wire conductors (8) comprises a testing pad (11) disposed on the circuit board (10). The non-contact IC card may comprise insulating means electrically insulating the other end of the testing wire conductors or the testing pads (11) from outside.

The present invention also resides in methods for manufacturing and testing the same.

Description

BACKGROUND OF THE INVENTION

This invention relates to a non-contact IC card and, more particularly, to a non-contact IC card in which a data is transmitted and received by using for example electromagnetic induction, electromagnetic coupling and microwave without being contacted from the outside. This invention further relates to a manufacturing and testing methods for it.
A known non-contact IC card sealed with a mold resin such as a liquid crystalline polymer can be tested about each of mounted elements before molding, but after it is molded it can be tested only as a whole by a reader/writer or a tester which transmits and receives a data by using for example electromagnetic waves indirectly without contacting.
Since a known non-contact IC card is tested only as a whole after molding, each function of an electronic circuit mounted therein or each electronic element mounted therein cannot be tested individually. It is therefore impossible to find individually each damaged function or electronic element which was damaged during molded.

SUMMARY OF THE INVENTION

Accordingly, one object of the present invention is to provide a non-contact IC card free from the above-discussed problems of the known non-contact IC card.
Another object of the present invention is to provide a non-contact IC card in which each of the particular electronic elements and the functions of the electronic circuit mounted therein can be tested as to whether or not it is damaged after molding.
Still another object of the present invention is to provide a method for manufacturing the non-contact IC card.
A further object of the present invention is to provide a testing method of the non-contact IC card.
With the above objects in view, the non-contact IC card of the present invention comprises a circuit board, an electronic circuit mounted on the circuit board and having a plurality of functions, a package sealing the electronic circuit and a plurality of testing wire conductors disposed on the circuit board and connected at one end to the electronic circuit and exposed at the other end from the package for individually testing the functions of the electronic circuit. Each of the other end of the testing wire conductors comprises a testing pad disposed on the circuit board. A non-contact IC card may comprise insulating means electrically insulating the other end of the testing wire conductors or the testing pads from outside.
The present invention also resides in methods for manufacturing and testing a non-contact IC card, comprising the steps of mounting an electronic circuit having a plurality of functions on a circuit board, providing a plurality of testing wire conductors on the circuit board for individually testing the functions of the electronic circuit, the testing wire conductors each having one end connected to the electronic circuit and the other end accessible for the individual function test, forming a mold resin on the circuit board to seal the electronic circuit except for the other end of the testing wire conductors and testing the electronic circuit with respect to the functions through the testing wire conductors. The method for manufacturing a non-contact IC card also comprises the steps of insulating said testing wire conductors from outside.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will become more readily apparent from the following detailed description of the preferred embodiments of the present invention taken in conjunction with the accompanying drawings, in which:

Fig. 1 is a schematic sectional view of an embodiment of the non-contact IC card of the present invention;
Fig. 2 is a schematic top plan view of the embodiment of the non-contact IC card illustrated in Fig. 1 but with the mold resin removed for clarity;
Fig. 3 is a schematic sectional view of the modified embodiment of the non-contact IC card illustrated in Fig.1 in which the testing pads are insulated from the outside by insulating means;
Fig. 4 is a schematic sectional view of another embodiment of the non-contact IC card of the present invention;
Fig. 5 is a schematic sectional view of the modified embodiment of the non-contact IC card illustrated in Fig. 4 in which the testing pads are insulated from outside by insulating means;
Fig. 6 is a schematic sectional view of still another embodiment of the non-contact IC card of the present invention;
Fig. 7 is a schematic top plan view of the embodiment of the non-contact IC card of the present invention illustrated in Fig. 6 but with the mold resin removed for clarity;
Fig. 8 is a cutting end view of the embodiment of the non-contact IC card of the present invention illustrated in Fig. 6 after cutting off of the testing pads;
Fig. 9 is a perspective view of the embodiment of the non-contact IC card of the present invention illustrated in Fig. 8;
Fig. 10 is a perspective view of the modified embodiment of the non-contact IC card illustrated in Fig. 8 in which the testing wires are insulated from outside by the resin;
Fig. 11 is a perspective view of the modified embodiment of the non-contact IC card illustrated in Fig. 9 while the testing wires are being insulated from outside by an insulating seal;
Fig. 12 is a perspective view of the embodiment of the non-contact IC card illustrated in Fig. 9 after insulated from the outside by the insulating seal;
Fig. 13 is a schematic sectional view of still further another embodiment of the non-contact IC card of the present invention;
Fig. 14 is a schematic top plan view of the embodiment of the non-contact IC card of the present invention illustrated in Fig. 13 but with the mold resin removed for clarity;
Fig. 15 is a fragmented schematic enlarged top plan view of the embodiment of the non-contact IC card illustrated in Fig. 14 showing connecting portions between the testing pads and the testing wires;
Fig. 16 is a sectional view of the embodiment of the non-contact IC card taken along line A-A in Fig. 15;
Fig. 17 is a cutting end view of the embodiment of the non-contact IC card illustrated in Fig. 13 after cutting off of the testing pads;
Fig. 18 is an enlarged schematic fragmented top plan view of still another embodiment of the non-contact IC card of the present invention but with the mold resin removed for clarity; and
Fig. 19 is an enlarged top plan view of the fuse in the embodiment of the non-contact IC card illustrated in Fig. 18.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

Fig. 1 illustrates one embodiment of the non-contact IC card of the present invention and Fig. 2 is a schematic top plan view of the embodiment of the non-contact IC card illustrated in Fig. 1 but with a package of a mold resin removed for clarity. The non-contact IC card comprises a circuit board 10 and an electronic elements 12 mounted on a surface of the circuit board 10. The electronic elements 12 are electrically connected to each other through wire conductors 15 which are disposed on the circuit board 10 and a coil antenna pattern 13 is disposed on both of the surfaces of the circuit board 10. As best seen from Fig. 2, the outer-most circuit of a coil antenna pattern 13 is along the circumferential outer edge of the circuit board 10. The coil antenna pattern 13 is connected to the electronic elements 12. The antenna pattern 13 may be disposed only on one surface of the circuit board 10. When the antenna pattern 13 is disposed on both surfaces thereof, a number of turns of the antenna pattern 13 can be increased as compared with that of on only one surface. Thus, the wire conductors 15, the electronic elements 12 and the antenna pattern 13 compose an electronic circuit 9 having a plurality of functions. The top surface (in Fig. 1) of the circuit board 10 is molded with a mold resin or a package 14 such as liquid crystalline polymer together with the electronic circuit 9. Testing pads 11 through which the electronic element 12 or the functions in the electronic circuit 9 is tested are attached to the bottom surface (in Fig. 1) of the circuit board 10 and are exposed outside. Each of the testing pads 11 is connected to the electronic elements 12 mounted on the top surface of the circuit board 10 through a plurality of testing wires 15a which extend through a plurality of through holes 16 which are formed in the circuit board 10.
Since the testing pads 11 connected to the electronic elements 12 which is completely molded by a mold resin are attached to the bottom surface of the circuit board 10, the testing pads 11 are not molded and are exposed outside even after the non-contact IC card was molded. Each of the electronic element 12 and each of the functions therefore can be tested easily by touching each of the testing pads 11 with a testing pin such as a tester. Thus, the testing wire conductors 8, each having one end connected to the electronic circuit 9 and the other end being the testing pad 11 and exposed outwardly from the mold resin 14, are composed of the testing wires 15a, the through holes 16 and the testing pads 11. Before the non-contact IC card is shipped, the testing pads 11 may be, if necessary, covered, as illustrated in Fig. 3, with insulating means 17 (See Fig. 11) which is an insulating film made for example of vinyl chloride resin to prevent an access from the outside. As shown in Fig. 2, the testing pads 11 are positioned on the bottom surface correspondingly to the position of the electronic elements 12 which are mounted on the top surface, the length of the testing wires 15a are therefore short and does not hinder the other wire conductors 15 of the electronic circuit 9.
Fig. 4 illustrates another embodiment of the non-contact IC card of the present invention, which has basically the same structure as that illustrated in Fig. 1 but is different in that both of the surfaces of a circuit board 10 are molded with a mold resin 24 such as liquid crystalline polymer except for the testing pads 11. So, the testing pads 11 are exposed outwardly. Each of electronic elements 12 and each of functions in an electronic circuit 9 can be tested through testing conductors 8 which are composed of the testing pads 11 and testing wire 15a electrically connecting the testing pads 11 and the electronic elements 12 together. After the test, the testing pads 11 may be buried in a resin 25 and insulated from the outside as illustrated in Fig. 5 to prevent an access from the outside and damage during shipping and storage. For the resin 25, for example, liquid crystalline polymer is suitable.
Figs. 6 and 7 illustrate still another embodiment of the non-contact IC card of the present invention, which also has basically the same structure as that illustrated in Fig. 1 but is different in that the circuit board 10 comprises an extending portion 10a which extend in a canti-levered manner and exposed outwardly from the mold resin and a plurality of testing pads 31 are disposed on only the top surface of the extending portion 10a of the circuit board 10. The testing pads 31 are exposed outwardly from a mold resin 34 together with the extending portion 10a of the circuit board 10. For details, both of the surfaces of the circuit board 10 except the extending portion 10a are molded with the mold resin 34 such as liquid crystalline polymer. The testing pads 31 are electrically connected to electronic elements 12 mounted on the circuit board 10 through testing wires 15b which are disposed on the circuit board 10. Since a coil antenna pattern 33 is disposed on the bottom surface of the circuit board 10 and only a connecting portion of the antenna pattern 33 for connecting to the electronic elements 12 is drawn out through a through hole 36 to the top surface of the circuit board 10, the antenna pattern 33 therefore does not hinder the wire conductors 15 and the testing wires 15b. After the molding, data is input and output through only the antenna pattern 33 by using electromagnetic induction and microwaves without any contact with the non-contact IC card. Only a necessary number of the testing pads 31 for individually testing the function or the electronic elements 12 may be disposed. Alternatively, the testing pads 31 may be prepared in a standardized fixed number to simplify the manufacturing process, and only needed testing pads 31 among them are connected to the electronic elements 12 and used for the test as illustrated in Fig. 7.
In this embodiment also, the non-contact IC card of the present invention as described above can be tested individually with respect to the individual elements 12 through the testing pads 31. After the test, the testing pads 31 are cut off along the phantom line 35 in Fig. 7 together with the extending portion 10a of the circuit board 10, and the cutting end thereof is chamfered and faired, whereby the cutting ends of the testing wires 15b are exposed outside as illustrated in Figs. 8 and 9. In this state, since the data and memory in the inside of the non-contact IC card may happen to be read or broken from the cutting end of the testing wire 15b after assembly and shipment, the cutting end of the non-contact IC card may be, if necessary, covered with the resin 38 such as liquid crystalline polymer completely, as illustrated in Fig. 10, to prevent the CPU and the memory from being electrically accessed from the outside. Alternatively, as illustrated in Fig. 11, the cutting end and both surfaces of the non-contact IC card may be covered with a suitable insulating means such as an insulating seal 39 made for example of vinyl chloride resin to insulate from the outside. The insulating seal 39 has two leaves 39a placed on the circuit board and the mold resin and the insulating seal 39 completely wraps the surfaces of the non-contact IC card with the leaves 39a. As described above, in this embodiment, the testing wire conductors 8 are composed of the testing wires 15b, the through holes 36 and the testing pads 31, and connected at one end thereof to the electronic circuit 9 and the other end of the testing wire conductors 8 is the testing pads 31 which is exposed from the mold resin 34. After testing, the other ends of the testing wire conductors 8 or the testing pads 31 are cut off together with the extending portion 10a of the circuit board 10 and the cutting end thereof is covered with insulating means made of an insulating material. Therefore, the testing wire conductors 8 are insulated from the outside by the insulating means. In this embodiment of the non-contact IC card, since the testing pads 31 are positioned along a straight line, the testing process is easy and can be also automatical. As the electronic circuit 9 is protected by the mold resin 34 which integrally molds, this non-contact IC card is mechanically strong and durable.
Figs. 13 and 14 illustrate still another embodiment of the non-contact IC card of the present invention, which is suitable for use for example in the case that a relatively large number of electronic elements 12 are mounted on the circuit board 10 and a large number of testing pads 41 are needed, and which has basically the same structure as that illustrated in Figs. 6 and 7 but is different in that the testing pads 41 are disposed on both surfaces of an extending portion 10a of the circuit board 10. As illustrated in Fig. 13, the testing pads 41a are disposed on the top surface of the circuit board 10 and the testing pads 41b are disposed on the bottom surface thereof, and the testing wires 15b which are connected to the testing pads 41 are pulled out to the top surface of the circuit board 10 through a plurality of through holes 36 and are connected to electronic elements 12 which are mounted on the top surface of the circuit board 10. The other structures are completely the same as that of Figs 6 and 7. As illustrated in Fig. 15, all the testing pads 41 are connected to the testing wires 15b to be used during test. In another way, as illustrated in Fig. 14, only the needed testing pads 41 among that prepared in a fixed number may be connected to be used during test. Further, in this embodiment also, similarly to the embodiment illustrated in Figs. 6 and 7, the testing pads 41 are cut off together with the extending portion 10a of the circuit board 10 at the cutting portion 45 in Fig. 13 after each of the electronic elements 12 mounted on the circuit board 10 are tested individually through the testing pads 41. Fig. 17 is an end view of the cut end thereof. As seen from Fig. 17, since the testing wires 15b are exposed outwardly, the cutting end may be insulated to be prevented from being electrically accessed from the outside by the same method as in the above embodiment.
As illustrated in Fig. 15 and Fig. 16, the testing pads 41a mounted on the top surface of the circuit board 10 and the testing pads 41b mounted on the bottom surface thereof may be overlapped in the perpendicular direction to the circuit board 10 (horizontally in the figures), however, the testing wires 15b which are mounted respectively on the top surface and the bottom surface should not be overlapped in the perpendicular direction to the circuit board 10. Because, if there are overlapped portions, when the testing pads 41 are cut off at a cutting portion 45 illustrated in Fig. 13 by cutting means having an electrically conductive metallic cutting edge (not shown), an electrical short-circuiting may occur between the testing testing wires 15b on the top surface and the testing wires 15b on the bottom surface through the metallic edge of the cutting means. When a cutting burr of the testing wire 15b on one surface may extend and connect to the testing wire 15b on the other surface thereof, the electrical short-circuiting may occur.
Figs. 18 and 19 illustrate still another embodiment of the non-contact IC card of the present invention, which has basically the same structure as that illustrated in Fig. 6 or that illustrated in Fig. 13. Different structure is that one portion of the testing wire conductor is formed into a fuse and the testing wire conductor is applied a high voltage from outside and burning off the fuse to be insulated from outside after testing. testing.
Similarly to the above embodiments illustrated in Figs. 6 and 13, the electronic elements 12 are mounted on a circuit board 10 and the circuit board 10 except the extending portion 10a of the circuit board 10 is molded with a mold resin such as liquid crystalline polymer. The extending portion 10a is exposed from the mold resin and extends outwardly in a canti-levered manner. manner. On the bottom surface of the circuit board 10, the antenna pattern 33 is disposed. As illustrated in Fig. 18, the testing pads 51 are disposed on the extending portion 10a and are connected to the electronic elements 12 through testing wires 55 disposed on the circuit board 10. Each of the testing wires 55 forks into two branches near the testing pads 51 in the mold resin, and the fuse 56 which has a small cross-sectional area is formed at the fork portion in the testing wire 55, the two branches of the testing wire 55 are connected to two of the testing pads 51a and 51b at the outside of the mold resin. Fig. 19 is an enlarged view of the fuse 56. After the electronic elements 12 has been individually tested through the testing pad 51a or 51b, a terminal 57 far being applied a high voltage and a grand terminal 58 are respectively connected to the testing pads 51a and 51b. Then, a high voltage is applied to the terminal 57 until the fuse 56 is burnt off and the testing wire 55 is insulated from outside. Then, the testing pads 51 may be cut off together with the extending part 10a of the circuit board 10. The fuse 56 which was burnt off by the high voltage provides a gap which insulates one end of the testing wire conductor 8 from the electronic circuit 9 and which functions as an insulating means for insulating the testing wire conductor 8. In this embodiment of the non-contact IC card of the present invention, by using a high voltage, the testing wire conductor after testing can be insulated easily from outside and can be prevented from being accessed from the outside.
As has been described, the non-contact IC card of the present invention comprises a plurality of testing wire conductors connected at one end thereof to an electronic circuit on a circuit board having a plurality of functions and exposed at the other end thereof from a package for individually testing any desired functions of the electronic circuit. Therefore, the functions and/or electronic components of the electronic circuit molded within the package can be individually tested, whereby the position of the faults or damages generated during the molding can be determined and a precise quality control can be achieved.

Claims

A non-contact IC card comprising:
a circuit board;
an electronic circuit mounted on said circuit board and having a plurality of functions;
a package sealing said electronic circuit; and
a plurality of testing wire conductors disposed on said circuit board and connected at one end to said electronic circuit and exposed at the other end from said package for individually testing said functions of said electronic circuit.
A non-contact IC card as claimed in claim 1, wherein each of said other end of said testing wire conductors comprises a testing pad disposed on said circuit board.
A non-contact IC card as claimed in claim 1, wherein said circuit board comprises an extending portion extending therefrom and exposed outwardly from said package, and said other ends of said testing wire conductors extend to said extending portion.
A non-contact IC card as claimed in claim 3, wherein said testing wire conductors are mounted on both major surfaces of said circuit board and said other ends of said testing wire conductors are disposed on both major surfaces of said extending portion.
A non-contact IC card as claimed in claim 4, wherein said testing wire conductors on each major surface of said circuit board are disposed alternately out of each other's mounted place completely each other, whereby an electrical short-circuiting between said testing wire conductors on each other's major surface thereof can be prevented.
A non-contact IC card as claimed in claim 1, further comprising insulating means electrically insulating said other end of said testing wire conductors from outside.
A non-contact IC card as claimed in claim 6, wherein each of said other end of said testing wire conductors comprises a testing pad which is disposed on said circuit board and is covered with said insulating means to be insulated from outside.
A non-contact IC card as claimed in claim 6, wherein said insulating means comprises an insulating sheet disposed on a surface of said circuit board to cover and insulate said other ends of said testing wire conductors exposed outwardly from said package.
A non-contact IC card as claimed in claim 8, wherein said insulating sheet has a fold folded along at least one side of said circuit board.
A non-contact IC card as claimed in claim 6, wherein said insulating means comprises a fuse disposed in said testing wire conductor within said package for being burnt off by a high voltage to disconnect said testing wire conductor therefrom.
A method for testing a non-contact IC card comprising the steps of:
mounting an electronic circuit having a plurality of functions on a circuit board;
providing a plurality of testing wire conductors on said circuit board for individually testing said functions of said electronic circuit, said testing wire conductors each having one end connected to said electronic circuit and the other end accessible for said individual function test;
forming a mold resin on said circuit board to seal said electronic circuit except for said the other end of said testing wire conductors; and
testing said electronic circuit with respect to said functions through said testing wire conductors.
A method for manufacturing a non-contact IC card comprising the steps of:
mounting an electronic circuit having a plurality of functions on a circuit board;
providing a plurality of testing wire conductors on said circuit board for individually testing said functions of said electronic circuit, said testing wire conductors each having one end connected to said electronic circuit and the other end accessible for said individual function test;
forming a mold resin on said circuit board to seal said electronic circuit except for said the other end of said testing wire conductors;
testing said electronic circuit with respect to said functions through said testing wire conductors; and
insulating said testing wire conductors from outside.